PDF malware analysis — malicious · d9712b41b8004644

MALICIOUS

PDF

31.9 KB

MD5: faf54449eaeab63893160c69a6aa8426 SHA-1: 284cb2fe6462f4f736684ec914f419494a05f6d1 SHA-256: d9712b41b8004644b655e190c5bee8e1b95cddc2c2ec20f3c6cee22f9e4937f3

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by ClamAV (Js.Exploit.HTML-30) and a machine learning classifier. High-severity heuristics indicate the presence of a risky XFA script and a numeric evaluation stager, commonly used to download and execute further malware. The embedded URL, while seemingly benign, is part of the exploit chain. The script's primary function appears to be downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT

PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
ClamAV: Js.Exploit.HTML-30 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Js.Exploit.HTML-30
XFA numeric character-table eval stager high PDF_XFA_NUMERIC_EVAL_STAGER

PDF XFA initialize script reads numeric form data from rawValue, maps the values through a short character table, and evals the reconstructed stage. This is an exploit-kit staging technique even when the final decoded layer remains encoded.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://www.xfa.org/schema/xfa-template/2.5/

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